Stability Impacts of an Alternate Voltage Controller (AVC) on Wind Turbines with Different Grid Strengths

Dimitrios Dimitropoulos (), Xiongfei Wang and Frede Blaabjerg
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Dimitrios Dimitropoulos: AAU Energy, Aalborg University, 9220 Aalborg, Denmark
Xiongfei Wang: AAU Energy, Aalborg University, 9220 Aalborg, Denmark
Frede Blaabjerg: AAU Energy, Aalborg University, 9220 Aalborg, Denmark

Energies, 2023, vol. 16, issue 3, 1-20

Abstract: This paper studies the stability impact of the alternate voltage controller’s (AVC) low-pass filter (LPF) in a wind turbine’s grid-connected voltage source converter (VSC). A small-signal model of the grid-connected converter is designed with a grid-following synchronization control. More specifically, the non-linear state-space model of the grid-connected converter was developed, including the dynamics of both the inner and outer control loops of the converter, the dynamics of the elements of the electrical system, as well as the digital time delay. An eigenvalue-based stability analysis gives insight into the stability impacts of the outer-loop controllers. It is proven that the cutoff frequency of the AVC’s LPF affects the phase-locked loop (PLL) and AVC bandwidths of instability, as well as the corresponding critical oscillation frequencies. This phenomenon is observed in both weak and strong grids. Consequently, the small-signal stability regions of the PLL and AVC bandwidth can be identified for the range of the AVC’s LPF cutoff frequency under study. The stability regions of the PLL and AVC, which are obtained from the small-signal model, as well as the determined critical oscillation frequencies, are validated through time domain simulations and fast-Fourier transformation (FFT) analysis.

Keywords: wind turbine; voltage source converter; small-signal model; stability analysis; alternate voltage control; eigenvalue-based stability analysis; time domain simulations (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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